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Patented Jan. 5, 1892.

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TH: Nonms P unlya wiwi/@maf I vIUNITED STAT-ES PATENT Gir-FICE.

WILLIAM'H. THEOBALD, OF NEW YORK, N. Y.

ENVELOPE.

- SPECIFICATION forming part of Letters Patent No. 466,382, dated January 5, 1892.

Application filed February 24, 1891. Serial No. 383,028. (No model.)

velopes designed to inclose registered letters.

offices.

Thev object of my invention is to provide an envelope of novel construction which may be simple and economically made, and also to be so constructed that itcannot be opened without the mutilation of some of its parts. I attain these objects 'by the construction illustrated in the accompanying drawings, in which Figure 1 is a bottom View of the 'envelope constructed in accordance with my invention, being shown open to receive letters or packages, the arrangement of one of the flaps being also shown in dotted lines, as when closed. Fig. 2 is a face view of 'the envelope closed and fastened, the protecting-flaps being indicated in dotted lines. Fig. 3 is a'rear view of the envelope closed. Fig. 4 is a view of the inner side of the envelope-blank having the lines on which it is to be folded shown by dotted lines. velope-blank having the long flap slightly modified in form. Fig. 6 is a bottom view of the open envelope produced by said blank.

In said drawings, A represents the body of the blank, which is folded to provide the rear face a and the front face bv with the four flaps of the envelope, said iiaps being given the formand arrangement relatively to each other as follows: A substantially rectangular flap d, suitably gummed andl projecting from one side of the face b, is to secure the long edge of the face a after the latter has been folded upon thejface b. A substantially rectangular ap c,.(having the corners cut off,) projecting from one end of the face b, is to be folded upon one end of the face a to secure one end of said faces together, and thus close one end of the envelope. A long flap or packages sentbetween United States post Fig. 5 is a view of the en-` f, equal in length to or longer than the envelope, projects from the opposite end of the face b, and is the movable closing-iap of the A envelope, and a substantially rectangular Hap e, ot' nearly half the length of the envelope and projecting from the unattached end of the face a, is adapted to be folded or tucked in over and partly around the letters or package placed Within the envelope. The sealingflap f has a portion of its length of the same width as the envelope and the balance preferably tapered, so that its outer end is about one-fourth thewidth of the envelope,its length being equal to the length of the envelope; but it is, inaddition, preferably provided with a tongue f2, to be folded over and around the end of the envelope and adapted to be secured (in addition to its gummed surface) by a staple, eyelet, or rivet g or other permanent metal fastening, which is made to pass through the doubled portion of said flap, as Well as through the faces a and b and the flap c. Said rivet may also be made to pass through one end of the inclosed package. The sealingfiap fis also provided with gummed edges adapted when the envelope is closed to be pressed down upon the face aand the flaps c d.

In the modicationshown in Figs. 5 and 6 the long iiapf has only one of its edges beveled, so that said edge forms a more acute angle with its straight portion,and While bringing its end near the corner of the envelope when folded and secured allows more room for printed directions on the face a of the envelope under said beveled edgeof the long iiap.

In use the letter or package to be secured in the envelope is placed in at the open end, after which the small tlap eis tucked in loosely around said letter or package. The extended sealing-Hap f is then turned over and secured in the manner hereinbefore described, thus fully protecting all the parts and providing a double fasteningfor all connected parts. To open the package, it is only necessary to cut the large sealing-tiapf from Yto Y, as indicated in Fig. 4, on the line where it folds over the open end of said envelope.

The envelope described is adapted only for registered letters or packages in the United States mail service. The construction described produces a very strong and safe e11- IOO velope. It is conveniently closed, and when Secured it cannot be opened or tampered with without mntilating the parts.

It is obvious that printed directions or sneh other printed matter as required may be placed on the front and rear face of the envelope te adaptit to the use for which it is especially desired, the printing en the rear face being se located that the Writing made by the postmaster will preferably be partly on the face a and partly en the lapf.

Having new fully described my invention, I claim- 1. An envelopehaving,besides theside and end flaps te unite the betteln face te the top face thereof, a flap on one end of the bottom face adapted te be folded and tucked in the VILLIAM II. THEOBALD.

lVitnesses:

ALEX. S. STEUART, E. E. MASSON. 

